Compressor



Oct. 23, I928.

(3.1.. STREBLER COMPRESSOR Filed May 12, 1926 ,4 Sheets-Sheet 1 Oct. 23,- 1928.

G. L. STREBLER COMPRES SOR Filed May 12, 1926 4 ShEetS-Shest 2 Oct. 23, 1928. 1689179 I G. L. STREBLER COMPRESSOR Filed May 12, 1926 4 Sheets-Sheet a AT E 0 GEORGE'L. STREBLER, on ST. LOUIS, MIssoum, ASSIGNOR TOSTREBL'ER'APPLIANCES,

Inc, OF ST. LOUIS, MISSOURI, A conronn'rion-or DELAWARE.

COMPRESSOR.

Application filed May 12, 1926. Serial No. 108,527.

This invention relates to compressors. 7

An object of the invention is to provide a compressor of the reciprocatingpiston type having the parts designed and arranged in a relationship whereby the operating mecha nism is maintained in alubricated condition thus facilitating the operation of the machine,

and, to a large extent, preventing noise and obtaining the desired results'in a shorter period of time than by use of other compressors with which I am familiar;

Another object ofthe'invention is to provide a compressor of-the reciprocating piston type having novel and efiicient means for silently operating the pistons Without the use of connecting rods and similar devices, thus preventing manyof the noises resulting from the operation of machines including'such connections.

Another object of the invention is to provide a compressor having a pair of axially alined cylinders, a reciprocating piston in each cylinder, a pair of reciprocating-frames embracing the cylinder structure between them, and mechanism engaging said frames outside the cylinders and'withoutthe use of connecting rods and the like whereby said pistons are re'ciprocated without causing side thrusts and other strains necessarily encountered in structures in which the reciprocating pistons are operated by connecting rods and a crank shaft.

Another object of the invention is to provide an improved compressor constructed and arranged so that the operating mechanism is maintained in a lubricated condition and whereby the oil is practically excluded fron the compressed air or gas.

Another object of the invention is to provide a compressor embodying the novel subject matter and obtaining the highly desirable results made apparent by the following description, reference being made to-the accompanying drawing, in which i Fig. 1 is a reproduction of a photographic perspective showing one-half of the machine housing and the operating mechanism therein.

Fig. 2 is'a similar view of the cylinder structure, the operating devices of the pistons being omitted. I

Fig. 3 is a similar perspective view of one of the connecting frames whereby the pistons are reciprocated. I A

Fig. 4: is a similar perspective view of the cylinder structure and anism assembled.

Fig. 5 is a reproduction of a photograph of a plan of the pistons and the operating mechanism therefor.

Fig. 6 is a cross sectional view of the cylinder and piston approximately on the line 6-6 of Fig. 7 K I Fig. 7 is a longitudinal sectional'viewof the cylinder devices and the pistons therein.

Fig. 8 is a cross sectional view approximate ly on the line 88 of Fig. 7.

Fig; 9 is a central transverse section of the assembled structure, and'Fig. lOis an inside elevation of the housing section complemem tary to the section shown in Fig. 1.

The housing of the machine comprises a pair of sections 1 and 20f approximately 'dulicate construction, one of'said sections" being shown in Fig. 1; The section 1 has a chamber 2 deepene'd'midway of its ends to provide an oil receptacle'3, it being'un'der stood that the other 'houlsi'ng 'section is' similarly constructed. Air" or gas to' be compressed is admitted to the housing through an inlet passage 4' through one ofthe sectionsand the compressed air or gas is c'ondu'c'ted'from the machine through an outlet passage The compressor mechanism is confined 'Within'the' housing composed of the two housing sections mentioned and, in the embodiment of the i'n-' vention shown, comprises a pair" off rigidly united cylinders preferably integrally united:

piston operating mechbya central body7 forming the inn wall of each cylinder andseparating the cyl inders from eachother;

The cylinder element is rigidly secured within the housing by bolts passing through ears 9'and being. screwed'into one of'the lious ing sections. j

A shaftlO extends through on of th e housing members and through the central body portion 7 of the cylinder element and is equipped with anti-friction bearings 11' preferably of the conical type having thrustsupport in the'housing members. The shaft 10 is a driven shaft and opera'tes the devices where by the pistons are reciprocated without being subjected to lateral thrusts or other strains caused by piston connecting rods. 1

The piston 12 is mountedfor reciprocating movement's in eachfcylinder' 6; The cylin'c er element has fiat sides 13 against-well of which sliding" erase: actuating 31.41"

mounted. Each frame 14 has an elongated slot 14" (Fig. 3) through which the shaft extends. The two frames 14'are rigidly connected at their ends by tie rods 15 extending through slots 16 in the walls of the respective cylinders 6, so as to permit longitudinal reciprocating movements of said frames 14. A pair of spaced thrust blocks or shoes 17 are removably attached to each frame 14 by screws 17 Each of the parts '17 is thereby held from movement in any direct-ion, except longitudinal movements to impart reciprocating movements to thepistons. Each of the blocks or shoes 17 has a groove 18 in its inner side. A pair of eccentrics 19 are rigidly held on the shaft 10 by nuts 19 (Fig.8) secured on the shaft and clamping the eccentrics against shoulders 19" on the shaft 10. The shoulders 19": are in a relationship to the frames 14 to prevent clamping of the eccentrics 19 against said frames 14, leaving the eccentrics freely rotative with the shaft without frictional resistance from said frames 14. This permits the frames 14 to be rec1procated by the eccentrics as will presently apear. p A bearing ring 20 is rotative on each eccentric 19. The peripheries of the rings 20 are shaped to fit closely in the grooves 18, the specific construction shown being that in which the ring grooves 18 and the ring 20 in cross section, are V-shaped. This perfect and close fit between each pair of blocks or shoes 17 and the corresponding ring 20 occurs in all positions ofthe eccentric. The eccentrics operate in the oil receptacle 3 and thereby provide I oil to the operating mechanism within the ti ve pistons 12 (Figs. 5 and 7) so that said pistons are reciprooated by the frames 14 when said frames are operatedby the eocentric devices described. The pistons 12 are hollow having integral heads 22 at their inner ends and having their outer ends closed by plates 23. Air or gas from the housing is admitted to the pistons through pipes 24, one of which opens into each cylinder 6, and through slots 25 in the pistons which are in constant communication with the openings from the pipes 24. The pipes 24 extend upwardly into chambers 26 in the upper portion of the housing whereby oil is prevented from entering the pipes. A poppet valve 27 is mounted in the head 22 on each piston, the stems 28 of said valves being'o erative in guides 29 forming the abutments or the ends of the valve springs 30, whereby the valves 27 are closed. Openings 31 permit the air or gas to pass to the valves 27 and thence into the inner ends of the cylinders 6 during operation of the compressor, as will hereinafter appear.

An outlet passage 32 from the inner end of each cylinder opens into a chamber 33 detachably secured to the upper side of the cylinder element by screws 34 and rigidly attached to the housing by screws 35. From the chamber 33 a passage 36 opens into the passage 5. It will be noted that the passages 32 extend in part through the head 7 of the cylinders 6 and thence through the walls of the cylinders. Looking at the piston 12 at the right of Fig. 7, which is at the end of its compression stroke, it will be seen that the piston is quite close to the cylinder head 7 and intersects the radial portion of the passage 32.

By obtaining this degree of close operation, practically all of the air or gas is forced from each cylinder by the compression stroke of the piston therein. This obtains greater efficiency in operation as practically no air or gas remains in either cylinder after completion of the compression stroke and a practically complete new charge is admitted each time.

A valve disc 37 is provided for each outlet passage 32. The valves 37 seat upon ground surfaces of the cylinder element and are actuated to closed position by a spring 38isecured to the cylinder element by a screw 39 and having pointed projections 40 engaging in correspondingly shaped recesses in the upper sides of the valves 37 (Fig. 7)

In operation, the eccentric devices 1.9-20 are rotated by the shaft 10, thus reciprocating the pistons 12. The pistons 12 move alternately to and from positions of compression. The position of compression of each piston is that in which its head 22 is adjacent to the partition body 7 of the cylinder element. During movement of each piston to position of compression, its valve 27 is closed, the air or gas from the cylinder in which compression is being effected being forced through the outlet passage 32, cansing the corresponding valve 37 to open, the spring 38 yielding for that purpose. During the movement of each piston from position of compression, the valve 87 controlling the outlet passage remains closed, with the result that the piston valve 27 is opened permitting the air or gas to pass into the cylinder for compression upon the next inward stroke of the piston.

In operation, this compressor is highly efficient, operates in practical silence, and obtains the desired degree of compression in a comparatively short period of time. The dimensions and the relationship of the parts may be varied widely within. equivalent limits without departure from the nature and principle of the invention as set forth in the appended claims. I

The same general type of compressor is ion III

disclosed and more broadly claimed in my'copending application Ser. No. 73,106, filed December 4, 1925.

I claim 1. A compressor comprising a cylinder having an inlet and an outletpassage, apiston within the cylinder, means controlling the passage of air orgas from said inlet passage through the piston and through sa-id'outlet passage from said cylinder, a sliding frame at the side of the cylinder conne ted with said-piston, means to support the frame for sliding movement, a pair of bearing shoes attached to said frame, an eccentric between said shoes, a ring rotative on said eccentric and engaging said shoes, and means for rotating said eccentric and thereby reciprocating said frame and said piston.

2. A compressor comprising a cylinder having an inlet and an outlet passage, a piston within the cylinder, means controlling the passage of air or gas from said inlet passage through the piston into the cylinder, a

reciprocable frame, means to mount the frame for reciprocable movement on said c linder, a pair of bearing shoes attached to saic frame, a rotative element between said shoes, a ring rotative about said element, and mechanism for rotating said element and causing said ring to reciprocate said frame and said piston.

3. In a. compressor, a housing havin a fluid-tight chamber formed to receive a lu ricant and also a fluid above the surface of the lubricant, a duplex pump in the chamber having a plurality of separate inlets projecting thereabove and in free communicatlon with the part of the chamber above the level of the lubricant, and a common means for actuating the duplex pumping elements having a part thereof submerged in the oil, thrust blocks secured to the respective pumping ele- .ments, the thrust blocks having substantially V-shaped grooves, and in which the common operating means has an eccentric interposed between the blocks and a freely rotatable ring on the eccentric submerged in the lubricant and having its periphery substantially conforming to the grooves of the thrust blocks.

4. In a compressor, av cylinder, a piston therein, a pair of slidable centrally slotted frames disposed. on opposite sides of the cylinder, means extending through the cylinder for connecting the ends of the frames together, each frame having a pair of spaced shoes, a shaft extending through the slots of the frames, and a pair of eccentrics on the shaft operating in the spaces betweenthe shoes for sliding the frames.

5. In a compressor, a cylinder, a piston therein, a slidable frame on each side of the cylinder, a pair of spaced shoes on each frame,

a shaft extending transversely of the frames I and cylinder, and eccentrics on the shaft in the space between the shoes for sliding-the frames.

6'. Ina compressor, a cylinder, a slidin'g frame on the cylinder, a pair of spaced shoes on the frame, a shaft extending transversely of the cylinder and frame, and an eccentric onthe shaft operating between'the shoes to effect sliding of the frame.

7. In a compressor, a cylinder, a'piston and means to'effect relative movementbetween the cylinder an'dpiston includingan eccentric, spacedmembers connected to one of the first two named means and means on the eccentric rotatable independently thereof and disposed in the space between said members and engaging each.

8. In a compressor, a housing composed of two sections having complementary recessed portions which jointly form a fluidtight chamber to receive a lubricant, and a fluid above the latter, pumping mechanism arranged in the chamber and having an inlet in free communication with the fluid in the chamber above the level of the lubricant, means to detachably connect said pumping mechanism to the inner face of one of said sections, means for operating the pumping mechanism having a part thereof submerged in the lubricant, and means to detachably connect the sections.

9. In a compressor, a housing composed of separable sections having confronting recessed parts formed to conjointly provide a fiuidtight chamber for receiving lubricant, and a fluid above the surface of the latter, the inner face of one of said sections being further formed with a recessed part forming a pocket closed at'its top and communieating with the chamber to receive said fluid, pumping mechanism arranged in the chamber and having an inlet extending freely into said pocket, means to secure the pumping mechanism at its upper and lower parts to the inner face of said section, means for operatmg the pumping mechanism having a part thereof submerged in the lubricant, and

means to detachably connect the sections.

10. In a compressor, a housing composed of a pair of complementary sections each having chambered portions, which latter confront each other and jointly constitute a fiuidtight chamber to receive a lubricant, and a fluid above the surface of the latter, said sections further each having a pair of pocket forming parts which latter are closed at their tops and communicate at their lower ends with the chamber, a multiple cylinder pump in the chamber having separate inlets extending into the respective pockets, means to secure the pump at its upper portion to the inner face of one of the sections at av point between the pockets, a pair of means to secure the pump at its lower ortion to the inner face of said section where y to provide 5 merged in the lubricant, and means to detachably connect the sections.

11. In a compressor, a housing having a fiuidtight chamber formed to receive a lubricant, a multiple cylinder pump in the cham- 10 her having a plurality of separate inlets in free communication with the part of the chamber above the lubricant level, thrust blocks secured to the respective pumping elements and having substantially V-shaped grooves, and a common operating means including an eccentric interposed between the blocks and having a freely rotatable ring on the eccentric submerged in the lubricant, said ring having its periphery substantially conforming to the grooves of the thrustblocks.

In testimony whereof, I have hereunto signed my name to the specification.

GEORGE L. STREBLER. 

